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            <h2 class="title" style="clear: both"><a id="SigmodStandard"></a>Standard Filters</h2>
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              <h3 class="title"><a id="idp81113728"></a>Resonant Low-pass filters</h3>
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              <h3 class="title"><a id="idp81152400"></a>Standard filters</h3>
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              <p>Hi-pass filters: <a class="link" href="atone.html" title="atone"><em class="citetitle">atone</em></a>, <a class="link" href="atonex.html" title="atonex"><em class="citetitle">atonex</em></a></p>
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              <p>Low-pass filters: <a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a>, <a class="link" href="tonex.html" title="tonex"><em class="citetitle">tonex</em></a></p>
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              <p>Biquad filters: <a class="link" href="biquad.html" title="biquad"><em class="citetitle">biquad</em></a> and <a class="link" href="biquada.html" title="biquada"><em class="citetitle">biquada</em></a>.</p>
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              <p>Butterworth filters: <a class="link" href="butterbp.html" title="butterbp"><em class="citetitle">butterbp</em></a>, <a class="link" href="butterbr.html" title="butterbr"><em class="citetitle">butterbr</em></a>, <a class="link" href="butterhp.html" title="butterhp"><em class="citetitle">butterhp</em></a>, <a class="link" href="butterlp.html" title="butterlp"><em class="citetitle">butterlp</em></a> (which are also called <a class="link" href="butbp.html" title="butbp"><em class="citetitle">butbp</em></a>, <a class="link" href="butbr.html" title="butbr"><em class="citetitle">butbr</em></a>, <a class="link" href="buthp.html" title="buthp"><em class="citetitle">buthp</em></a>, <a class="link" href="butlp.html" title="butlp"><em class="citetitle">butlp</em></a>)</p>
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              <p>General filters: <a class="link" href="clfilt.html" title="clfilt"><em class="citetitle">clfilt</em></a></p>
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